#include<bits/stdc++.h>
using namespace std;

int n,l,r;

int main(){
	freopen("candy.in","r",stdin);
	freopen("candy.out","w",stdout);
	scanf("%d%d%d",&n,&l,&r);
	int m=l/n*n;
	if(r-m+1>=n) printf("%d",n-1);
	else printf("%d",r%n);
	return 0;
} 
